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[How to] Dual Boot on the Samsung Galaxy S2 I9100

It is well known that a computer can have more than one Operating System. Similarly, some Android devices also support 2 Operating Systems simultaneously and Samsung Galaxy S2 I9100 is one of those rare devices. This feature is known as Dual Boot. This is achieved by sharing the kernel and using a hidden partition in dev/block to store the 2nd ROM’s /system and the /sdcard (Internal storage) to store /data and /cache inside a hidden folder (/sdcard/.secondrom).

This feature can solve the doubt of a user – whether to use the stock Touchwiz ROM or switch to a CyanogenMod based ROM. An individual can have both the ROMs at the same time. It should be noted that Gingerbread ROMs are not supported. The user must be on Ice Cream Sandwich or above.